Background in case you want it, and more old oil analysis reports:
Settled back into 5k oil changes since I don't put tons of miles on this truck and many of them are offroad or heavily loaded. Would rather check on things approximately yearly and not longer than that.
I also did a piston soak with Chemtool before this OCI (did a short "rinse" to make sure I got all the solvent out too).
Here's some long term data -- have fun let me know what you think
Hey folks,
First oil analysis on my 99 4Runner with 3RZ-FE engine. At the time of the oil change the engine oil (Rotella 5W-40 CJ-4) had about 5000 miles on it and the engine had 235k.
Everything looks good except for the 180ppm of sodium. The lab states that they think it comes from the oil additives but both the CJ-4 and CK-4 VOAs don't show sodium: https://bobistheoilguy.com/forums/ubbthreads.php/topics/4490450/1/Shell_Rotella_T6_5W40_CJ-4/SM_
Comments?
First oil analysis on my 99 4Runner with 3RZ-FE engine. At the time of the oil change the engine oil (Rotella 5W-40 CJ-4) had about 5000 miles on it and the engine had 235k.

Everything looks good except for the 180ppm of sodium. The lab states that they think it comes from the oil additives but both the CJ-4 and CK-4 VOAs don't show sodium: https://bobistheoilguy.com/forums/ubbthreads.php/topics/4490450/1/Shell_Rotella_T6_5W40_CJ-4/SM_
Comments?
- JZiggy
- Replies: 52
- Forum: Used Oil Analysis - Gasoline
Settled back into 5k oil changes since I don't put tons of miles on this truck and many of them are offroad or heavily loaded. Would rather check on things approximately yearly and not longer than that.
I also did a piston soak with Chemtool before this OCI (did a short "rinse" to make sure I got all the solvent out too).
Here's some long term data -- have fun let me know what you think